I was in Savers Drug Store today and the staff were pushing these toothbrushes at the counter like crazy, seems a decent decent price at £19.99. Supposedly holds it's charge for a week.

Comes with a two-pin UK plug that is only suitable for two-pin UK electrical sockets(bathroom sockets)• Number 1 toothbrush brand recommended by dentists worldwide• 3D movement cleaning system oscillates, rotates and pulsates to mimic the shape of professional cleaning tools• The CrossAction removes up to 100% more plaque than a regular manual toothbrush• Timer indicates dentist-recommended brushing time of two minutes with 30 second intervals• Included in pack: Rechargeable toothbrush handle, charging station, travel case, one CrossAction brush head